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Angeliki Giannou

8 accepted papers

2025

Everything Everywhere All at Once: LLMs can In-Context Learn Multiple Tasks in Superposition

ICML 2025spotlight

Large Language Models (LLMs) have demonstrated remarkable in-context learning (ICL) capabilities. In this study, we explore a surprising phenomenon related to ICL: LLMs can perform multiple, computationally distinct ICL tasks simultaneously, during a single inference call, a capability we term task…

Cited by 3SourcePDFScholar
2025

How Well Can Transformers Emulate In-Context Newton's Method?

AISTATS 2025poster

Transformer-based models have demonstrated remarkable in-context learning capabilities, prompting extensive research into its underlying mechanisms. Recent studies have suggested that Transformers can implement first-order optimization algorithms for in-context learning and even second order ones fo…

Cited by 0SourceScholar
2024

Accelerated Regularized Learning in Finite N-Person Games

NeurIPS 2024poster

Motivated by the success of Nesterov's accelerated gradient algorithm for convex minimization problems, we examine whether it is possible to achieve similar performance gains in the context of online learning in games. To that end, we introduce a family of accelerated learning methods, which we call…

Cited by 0SourcePDFScholar
2024

Stochastic Methods in Variational Inequalities: Ergodicity, Bias and Refinements

AISTATS 2024poster

For min-max optimization and variational inequalities problems (VIPs), Stochastic Extragradient (SEG) and Stochastic Gradient Descent Ascent (SGDA) have emerged as preeminent algorithms. Constant step-size versions of SEG/SGDA have gained popularity due to several appealing benefits, but their conve…

Cited by 5SourcePDFScholar
2023

Dissecting Chain-of-Thought: Compositionality through In-Context Filtering and Learning

NeurIPS 2023poster

Chain-of-thought (CoT) is a method that enables language models to handle complex reasoning tasks by decomposing them into simpler steps. Despite its success, the underlying mechanics of CoT are not yet fully understood. In an attempt to shed light on this, our study investigates the impact of CoT o…

2023

Looped Transformers as Programmable Computers

ICML 2023poster

We present a framework for using transformer networks as universal computers by programming them with specific weights and placing them in a loop. Our input sequence acts as a punchcard, consisting of instructions and memory for data read/writes. We demonstrate that a constant number of encoder laye…

Cited by 110SourcePDFScholar
2022

On the convergence of policy gradient methods to Nash equilibria in general stochastic games

NeurIPS 2022accept

Learning in stochastic games is a notoriously difficult problem because, in addition to each other's strategic decisions, the players must also contend with the fact that the game itself evolves over time, possibly in a very complicated manner. Because of this, the convergence properties of popular…

Cited by 22SourcePDFScholar
2021

On the Rate of Convergence of Regularized Learning in Games: From Bandits and Uncertainty to Optimism and Beyond

NeurIPS 2021poster

In this paper, we examine the convergence rate of a wide range of regularized methods for learning in games. To that end, we propose a unified algorithmic template that we call “follow the generalized leader” (FTGL), and which includes as special cases the canonical “follow the regularized leader” a…

Cited by 31SourcePDFScholar